With this tech, zombie/skeleton units would have the option to voluntarily explode, destroying itself, but spraying surrounding enemy units with infected body parts, with a 20-30% chance of killing said enemy unit(determined for each enemy unit individually) and converting it into a zombie unit after, say, 2 turns have elapsed following the infection...

Research time: 8 turns

What do you think, too overpowered?

It's better to keep your mouth shut and let people wonder if you're a fool than to open it and remove all doubt...

It would have to have a very limited range of effect, of course...like only adjacent units being potentially affected...and the percentage of success could be lower, of course...say 10%...otherwise the enemy unit is completely unaffected...

And...wait, did you say 'unrealistic'? We're talking about ZOMBIES!!'lol!!!!

It's better to keep your mouth shut and let people wonder if you're a fool than to open it and remove all doubt...